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Finding the Fourth Proportional to 715.10, 1,072.63 and 386.19

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Solution

The fourth proportional to 715.10, 1,072.63 and 386.19 is: 579.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    715.10 : 1,072.63 = 386.19 : x
  2. Step 2: Convert to fraction form
    715.10/1,072.63 = 386.19/x
  3. Step 3: Cross multiply
    715.10x = 1,072.63 × 386.19
  4. Step 4: Simplify right side
    715.10x = 414,238.98
  5. Step 5: Solve for x
    x = 414,238.98/715.10
  6. Step 6: Final answer
    x = 579.27

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.